Aspherical helium-filled weather balloon has a radius of 1.10 m. a. compute the magnitude of the buoyant force on the balloon. (b) the balloon's rubber skin has a mass of 1.20 kg. when released, what is the magnitude of the balloon's initial acceleration if it carries a payload with a mass of 3.52 kg? density of air =1.29 kg/m^3 and density of helium=0.180 kg/m^3

The discovery of the electron as a subatomic particle was a result of

Photons with the highest energy have the longest period

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.